Browsing by Author "Feinberg, Joshua M"

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    Data for Evolving Mineralogy and Reactivity of Hematite-Coated Sands During Reduction by Fe(II) of 4-Chloronitrobenzene in Column Reactors
    (2024-10-14) Harris, Celina M; Soroush, Adel; Hildebrandt, Alanna M; Amen, Kamilah Y; Corcoran, Louis G; Feinberg, Joshua M; Arnold, William A; Penn, R Lee; arnol032@umn.edu; Arnold, William; Arnold, Penn and Feinberg labs at the University of Minnesota
    This study explores the reaction of contaminants mediated by iron oxide minerals in a column reactor that simulated iron reducing groundwater conditions. Reaction of the model nitroaromatic pollutant with hematite-coated sand in column reactors leads to growth of goethite and evolving reactivity due to changes in accessible surface area. Data collected include concentrations of the model pollutant (4-chloronitrobenzene) and its reaction product, the amount of new iron oxide mineral formed, and chloride concentrations in tracer studies.
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    Heating, Susceptibility, and XRD data for Differential thermal analysis using standard rock magnetic equipment
    (2021-11-16) Doctor, Rashida K; Feinberg, Joshua M; docto005@umn.edu; Doctor, Rashida K; University of Minnesota, Institute for Rock Magnetism, Feinberg Group
    Data for "Differential thermal analysis using standard rock magnetic equipment", including susceptibility measurements, powder x-ray diffraction, and differential scanning calorimetry. Used in determining how to use the high temperature susceptibility bridge for crude differential thermal analysis.
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    Magnetic Property Measurements for Two Mixed Polytype Pyrrhotite Samples
    (2022-04-19) Hobart, Kathryn K; Feinberg, Joshua M; Jones, Daniel S; Volk, Michael W R; hobar010@umn.edu; Hobart, Kathryn K; Institute for Rock Magnetism
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    Paleomagnetism and age of the Leucite Hills Volcanic Complex, Wyoming: Implications for eruptive history, landscape evolution, and the geomagnetic instability timescale (GITS)
    (2023-02-22) Welsh, Josie T; Feinberg, Joshua M; Schneider, Emma L; Pares, Josep M; Jicha, Brian R; Singer, Bradley S; Carroll, Alan R; feinberg@umn.edu; Feinberg, Joshua M; Institute for Rock Magnetism
    The Leucite Hills Volcanic Field, southwest Wyoming comprises two dozen volcanic features including necks, flows, dikes, and plugs. It has been the focus of many petrologic studies as its volcanic and shallow intrusive rocks are one of the only surficial manifestations of ultrapotassic lamproite. We build on paleomagnetic findings of Sheriff and Shive (1980) by providing further paleomagnetic data from the Boars Tusk dike and Black Rock flows. We also characterize the magnetic mineral assemblage of these lamproites. Principal component analysis of alternating field (AF) and thermal demagnetization data indicate that the dike and breccias of Boars Tusk record a reversed magnetic polarity and the Black Rock lava records a normal polarity, both consistent with previous findings. This recording is typically carried by minerals with coercivities >15 mT and susceptibility measurements indicate magnetite, maghemite, and titanomagnetite as likely magnetic carriers. AF and thermal demagnetization experiments evince secondary magnetizations held by lower coercivity grains, likely caused by lightning strikes. 40Ar/39Ar incremental heating experiments from Boars Tusk and Black Rock give plateau ages of ~2500 ka and ~900 ka, respectively. Recent advances in the chronology of geomagnetic field reversals and excursions during the Quaternary permit integration of the Boars Tusk dike into the lower Matuyama chron, whereas the Black Rock lavas most probably record the Kamikatsura excursion. Notably, Black Rock records high inclinations that suggest the short-lived excursion achieved a full geomagnetic reversal, something not observed at other localities recording the Kamikatsura excursion. The Leucite Hills offer further opportunities to refine the Quaternary geomagnetic instability time scale (GITS), and to improve understanding of the eruptive and geomorphic evolution of this unusual volcanism.
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    Twin Cities Metropolitan Area Groundwater Chloride Data, 1965-2021
    (2021-11-23) McDaris, John R; Feinberg, Joshua M; Runkel, Anthony; Levine, Jonathan; Alexander Jr., E. Calvin; Kasahara, Sophie; mcda0030@umn.edu; McDaris, John
    This dataset is compiled from 55 years of groundwater quality testing work done by the Minnesota Pollution Control Agency, the Minnesota Department Natural Resources, and the Minnesota Department of Health.